Radio coil and switch assembly



Nov. 24, 1936- c. L. WALKER AL 2,062,253

I RADIQ COIL AND SWITCH ASSEMBLY Filed June 9, 1936 2 Sheets-Sheet l 1 ENT R.S CHESTER L wL- R DAN/EL a M04 772 r BY WILL/AM 2(155544 ALLEMIIL QMZh ATTORNEY.

v 24, 1936. c. L. WALKER ET AL 2 062,253

RADIO COIL AND SWITCH ASSEMBLY I Filed Jun 9, 1936 2 Sheets-Sheet 2 662': TIE z. W44KQ DAN/EL MOATZ 8r BY WILL/AM 2U55LL AL -LEMIZI.

Patented Nov. .24, 1936 Chester L. Walker, Daniel B." Moatz, and William Russell Allen, 311, Springfield, Mass, assignors to United American Bosch. Corporation,

Springfield, Mass, a corporation of New York Application June 9, 1936, Serial No. 84,246 .10 Claims. (Cl. 171-119) This invention relates to radio apparatus and.

more particularly to an interstage coil and switch assembly, comprising a band changingapparatus for all wave receivers capable of reception on other frequency bands as .welljas the broadcast band. The subject matter herein constitutes an improvement on a similar structure shown and described in the copending application of Chester L. Walker and Ken L. 'Hendersonior Radio 1o coil and switch assembly", Serial No. 13,840; filed March 30, 1935. in such-devices it has been found that the coils are not supported with sufficient rigidity to prevent vibration from occurring.

The vibrations may arise from the action of the receiver loudspeakeror from other causes and re' sult in adversely affecting the electrical characteristics of circuits including the coils.

An object of this invention, therefore, is to provide a unitary coil and switch assembly which is more reliable and eflicient in operation.

' Another object is to provide a coil and switch assembly which is more simple and economical in construction.

Still another object is to provide a coil and switch'assembl'y which affords a more rigid and compact structure. v

A furtherobject is to provide a. unicontrolled band. changing assembly comprising a groupof sectional units in which any unit is readily replaceable.

Other objects and advantages will in part be specifically set forth and in part be obvious when the following specification is readin connection with thedrawings; in which:

5 Fig. 1 is a front view of the coil and switch assembly; Fig. 2 is a perspective view of the supporting bracket; and 3 is a simplified top plan view of a unicontrolled tandem assembly of individual coil and switch sections'suitable for installation in a receiver.

Referring in more detail to Fig. 1 the numeral I indicates the front wall of the bracket shown in Fig. 2. The lugs 2 and 3 support a multi-pole rotary switch 4 of a. well known type and comprising a rotary member 5 having a slot 6 to reaceive an-operating shaft. The member 5 can'ies contacts I and 8 which cooperate with the terminals 9 mounted on the stationary member. The coil forms "I, ll, l2, and III are provided 50. with the usual coil terminals comprising soldering lugs M. The lugs H are soldered directly to the switch terminals 9 as shown and the coil forms are thus supported with a minimum of stray capacity and inductance. Such stray capacity and inductance as there is remains convide additional bracing against vibration.

stant under all conditionsof handling and once compensated for need not againbe considered. As shown in Fig. 3, a second multipole switch 4a is connected to the rear end'of the coilfforms in the same manner as the connections. shown 5,

. in Fig. 1. The trim and other compensating condensers are represented generally'as l5 and are attached to the respective coil forms by solder-, ing' their terminals directly to soldering lugs carried by the coil forms. Referring .to Fig. 2, the front wall I of the bracket has extruded bosses IE on the rear side thereof which are received within theiront end of the coil forms to brace them against vibration or relative displacement. Each of the bosses l6 is provided witha key 16a which cooperates with a. slot in the end of the associated coil form to comprise a positioning and locating means. Each 7 key 16a is disposed at a different point on the circumference of the bosses Hi to insure that the go proper coil is placed in its correctposition in the assembly. The bracket has rearwardly extending web members I! and I8 which connect the front wall I with an upright rear flange Ill. The flange I 9 has two arms terminating in lugs 20 25 and 2| which support a second multipole rotary switch 4a of the type shown in Fig. 1. A drawbolt 22 is attached to thefront wall I and carries a clamping plate 23 which contacts the rear end of the coil forms l2 and I3 of Fig. '1 to pro- 30 In Fig. 3 is shown a simplified view of a com plete unicontrolled coil and switch assembly for a superheterodyne receiver of the allwave type, embracing four separate wave bands. In re- 35 ceivers employing'a single stage of radio fre quency, an oscillator and a modulatoigja-set of coils is required for each stage. The letter A indicates a coil section; serving theinp'ut or radio frequency stage, while B refers to an interstage 4o any coil section, for example B, may be individually removed and replaced without disturbing the adjacent sections or wiring connections. When removed, all solder joints of each section are completely accessible, with the aperture in the front wall I affording ready access to the connections at the terminals of the front switch 4 55 v as shown in E181 1. For the sake of slmplifl -tion, the condensers l5 which normally overlie the coil forms I0, ll, I2, and I3, are not shown in' Fig. 3. The front walls I extend above the 5 coils to provide shielding between sections A, B,-

and C, but additional shielding maybe added in the form of a single shield cover for the entire assembly, or individual covers for each section if desired. T

It will be seen that the structure herein shown and described is convenient for repair and replacement, has a minimum of solder joints, and

- has nowirlng .to become disarranged and alter stray capacities and inductances.

Many changes and modifications'may be made by any one skilled in the art without departing from the spirit and scope of the invention as defined in the following claims.

We claim:

1. In a multiple coil and switch assembly, a

bracket, a pair of multipole switch members supported in spaced relation upon said bracket, a front wall on said bracket and having a plurality ofprojections extending from the rear side thereof, a plurality of coil forms carrying windings,

means including said switch members for sup-. porting said coil forms, and means including said projections for preventing Y relative displacement between said coil forms.

2. In amultiple coil and switch assembly, a

bracket having a front wall, a pair-of multipole switch members supported 'in spaced relationupon said bracket, a plurality of coil forms carrying windings, means for supporting said coil forms upon said switchmembers, and means on said front wall engaging one end of said coil forms to prevent relative displacement thereof.

3. In a multiple coil and switch assembly, a

bracket having a front wall, a. pair of multipole --upon said bracket, a plurality .of coil forms carrying means forsupporting said coil forrfns uponsaid switch members in parallel axial alignment, and means on said front wall engag- 4o switch members supported in spaced relation ave displacement thereof.

l; In-a multiple coil and switch assembly, a bracket having a frontwall, a pair' of multipole switch members. supp rted in spaced relation '45 ing on'endof said coil forms to prevent rela- 5 upon said,bracket,' a plurality of coil forms carwindings, electrical terminals on each coil formatfei fer end-thereof, means comprising aid? tl' mlnals'forsuppfi 'l m Said coil forms on members, nd means on said front cawa le'nsa vent relativ displacement thereof.

'alm fi l 'co l andswitch em ly a brackethavinga front wall, a pair of, multipole switch, members supported, in spaced relation on so .on said bracket, a plurality of, coil .forms carryingljvinding sflelectrical terminals at either end of d coil forms; means comprising said terbne end' of said coil forms to prea second multipole switch member secured to 10 said rear flange, and a plurality-of coil forms jointly supported by said switch members and e ga ing a.- portion of said front wall. 7. In a" multiple coil and switch assembly, a

bracket having an upwardly extending front wall 15 and an upright rear flange spaced from said front wall, a multipole switch member secured to said front wall adjacent an aperture therein, a second multipole switch member secured to said rear flange, aplurality of coil forms supported in 20 parallel axial alignment bysaid switch members whereby one end of said coil forms engages the rear side of said front wall, and clamping means extending rearwardly from said front wall and engaging the. rear end of adjacent coil forms. 25 8. In a multiple coil andjswitch assembly, a plurality of independent aligned sections, each section comprising a bracket having a front wall, a pair of multipoleswitch members supported in spaced relation upon said bracket, 9. plu- 30 rality of coil forms jointly'supportedby said switch members, means on said front wall engaging one-end of said cell forms to prevent relative displacement thereof,'and a common acswitch members of all of saidjsections.

9. In a multiple coil and switch assembly, a. plurality of independent aligned sections, each section comprising a bracket having a front wall,

a pair of multipole switch members supported 40 in spaced relation upon said bracket, a plurality of coil forms jointly supported by said switch members, means extending rearwardly from said front wall engaging said coil forms and preventactuating means for simultaneously controlling the switch members of all of said sections.

10. In a multiple coil and switch assembly, ,a bracket having an upwardly extending front wall and an upright rear flange spaced from said front wall, a plurality of bosses on the rear side of said front wall, a loca g means on each of said bosses, a plurality of tubular coil forms supported on said bracket with each receiving one of said =ing relative displacement thereof, and a common 5 bosses within an open end thereof, and means cnns'rm L. WALKER. I

DANIEL R. MOATZ. WILLIAM RUssEL ALLEN, III. 

